Class: Classifieds::Listing

Inherits:
Object
  • Object
show all
Defined in:
lib/classifieds/listing.rb

Overview

describes a classified advertisement

Constant Summary collapse

MAX_LINE_LENGTH = 
100
@@all_listings =

A Listing has one item and one seller, along with listing-based attributes such as the listing start date

[]

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(id, item, seller, start_date) ⇒ Listing

Returns a new instance of Listing.



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# File 'lib/classifieds/listing.rb', line 6

def initialize(id, item, seller, start_date)
  @id = id
  @item = item
  @seller = seller
  @start_date = start_date
  Classifieds::Listing.all << self
end

Class Method Details

.clear_all ⇒ Object

Empty list of created objects



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# File 'lib/classifieds/listing.rb', line 15

def self.clear_all
  Classifieds::Item.clear
  Classifieds::Seller.clear
  self.clear
end

.fmt_cols(values, formats) ⇒ Object

Formats an array of strings according to an array of formats



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# File 'lib/classifieds/listing.rb', line 54

def self.fmt_cols(values, formats)
  result = ''
  values.each_with_index { |value, index| result << "#{fmt_col(value, formats[index][0], formats[index][1])} " }
  result
end

.fmt_detail_attr(string, width) ⇒ Object

Format a detail attribute



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# File 'lib/classifieds/listing.rb', line 63

def self.fmt_detail_attr(string, width)
  "#{lfmt(string, width)}"
end

.fmt_detail_val(string, wrap_indent) ⇒ Object

Format a detail value (with wrap if necessary)



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# File 'lib/classifieds/listing.rb', line 73

def self.fmt_detail_val(string, wrap_indent)
  new_string = string.strip
  if new_string.size > MAX_LINE_LENGTH
    new_string = ''
    new_line = "\n  #{' '*wrap_indent}  "  # Indent size of Attribute display width.
    line_len = 0
    string.split(' ').each { |word|
      new_string << "#{word} "
      if (line_len += word.size + 1) > MAX_LINE_LENGTH
        new_string << new_line
        line_len = 0
      end
    }
  end
  new_string
end

.format_detail(attr, attr_width, val) ⇒ Object

Format a detail item



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# File 'lib/classifieds/listing.rb', line 68

def self.format_detail(attr, attr_width, val)
  "#{fmt_detail_attr(attr, attr_width)}: #{fmt_detail_val(val, attr_width)}"
end

.print_summary(item_class, start_index, end_index) ⇒ Object

Prints the specified summary listings for the specified item subclass



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# File 'lib/classifieds/listing.rb', line 30

def self.print_summary(item_class, start_index, end_index)
  puts "    #{item_class.summary_header} #{Classifieds::Seller.summary_header} #{lfmt('List Date', 10)}"
  all[start_index..end_index].each_with_index { |listing, index| puts listing.summary_detail_row(start_index+index+1) }
end

.scrape_listing_details(item_class, detail_url, item_condition, detail_values) ⇒ Object

Returns detail attributes and values in detail_values hash



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# File 'lib/classifieds/listing.rb', line 43

def self.scrape_listing_details(item_class, detail_url, item_condition, detail_values)
  detail_doc = Nokogiri::HTML(open(detail_url, :read_timeout=>10))
  item_class.scrape_results_detail_page(detail_doc, item_condition, detail_values)
end

.scrape_listings(item_class, results_url) ⇒ Object

Creates listings from summary web page



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# File 'lib/classifieds/listing.rb', line 36

def self.scrape_listings(item_class, results_url)
  results_url_file = open(results_url, :read_timeout=>10)
  results_doc = Nokogiri::HTML(results_url_file)
  item_class.scrape_results_page(results_url, results_url_file, results_doc)
end

Instance Method Details

Prints a detail listing for a single item



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# File 'lib/classifieds/listing.rb', line 22

def print_detail(item_number)
  addon_details = {:Phone => @seller.phone, :'Listing #' => @id}
  puts '',
       self.summary_detail_row(item_number),
       @item.details_to_string(addon_details)
end

#summary_detail_row(item_number) ⇒ Object

Prints a summary detail row



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# File 'lib/classifieds/listing.rb', line 49

def summary_detail_row(item_number)
  "#{(item_number).to_s.rjust(2)}. #{@item.summary_detail} #{@seller.summary_detail} #{Classifieds::Listing.lfmt(@start_date, 10)}"
end